IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

Menon — Fri, 11 Nov 2022 11:07:00 GMT

Hello,

AFAIK, iOS and macOS will only display BLE accessories which are naively supported in the OS.Since your are working with MIDI devices this seems to be fine and I think the problem relies with your Application

May be you have missed to include MIDI device UUID in the advertisement packet.Please refer here to do this.

Kind Regards,

Abhijith

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

Menon — Wed, 09 Nov 2022 13:50:18 GMT

Hello,

Letting you know I am on this case and need some more time.

Thank you for understanding.

Kind Regards,

Abhijith

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

piotrosiotr — Mon, 07 Nov 2022 18:43:34 GMT

So I've tried to compare my device with other ones, also spent some time on searching info about my issue.

So the first thing I found was this. Here I read this: iOS devices will not pair with BLE devices unless one of the device's characteristics specifies that encryption is required. So the next question is: how to show to iOS device that encryption is required? Maybe I need to edit the prj.conf file to add it?

The second thing was observed when I tried to compare services and characteristics to ROLI Lightpad device ones. I found that it contains not only BLE MIDI and BAS (battery) services, but also the service called "Device Information" with 16-bit UUID 0x180A that contains manufacturer and model info. So I guess that it is a kind of standard service and maybe it is also required by iOS for device discovering. I think I need some example that shows how to implement it, but I can't find one. I guess that adding any standard service is much more simple then adding a custom one, e. g. for adding battery service I need to enable it in prj.conf using CONFIG_BT_BAS=y and implement some functions in my code.

King regards,
Piotr

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

Menon — Thu, 27 Oct 2022 13:53:19 GMT

Hello,

I was checking whether there is any known issue with the IOS versions. Didn't find much on this. Could you provide the sniffer traces, So to get an idea on what's happening over the Air.

You can follow this guide for capturing the traces.

Kind Regards,

Abhijith

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

piotrosiotr — Wed, 26 Oct 2022 13:59:24 GMT

Hello,
Yes, I can. nRF Connect Device Manager also can see it. I use latest iOS (v16.0.2) and macOS Big Sur (v11.6.5).
King Regards,

Piotr

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

Menon — Wed, 26 Oct 2022 13:35:26 GMT

Hello,

Whether you able to see the device through nRF connect application? Could you please provide the IOS version you are trying with.

Kind Regards,

Abhijith

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

piotrosiotr — Tue, 25 Oct 2022 10:44:08 GMT

Yes, I've tried to clear all cashed BT devices, but it didn't help to me. I still can't see my device in Settings-->Bluetooth until I connect it using BLE Scanner app. I think that the reason is in the way in which default BLE search goes, it obviously different from BLE Scanner app, but I don't have any idea, in which way.
Thank you for reply.

RE: IOS and macOS devices can't connect to BLE MIDI device (nrf52832)

Menon — Mon, 24 Oct 2022 09:42:31 GMT

Hello,

Did you connect your board earlier with the same iPhone/Mac book you are trying? If so, this might be because of the attribute caching. iOS keeps a history of the previous connection. So it doesn't want to rediscover the device. Could you clear your cache once and give it a try? You can do this by:

Settings--> Bluetooth--> Forget every Bluetooth device in the "My device list"--> Restart the phone/device.

Cache will be cleared after this. Let me know if this helps or whether you are still struggling to connect.

Kind Regards,

Abhijith